Can I replace the brake mechanism on my Performance Power hover mower?

The braking mechanism on the electric motor of my Performance Power electric hover mower (this is an assembly consisting of a spring-loaded plate and a brake disc, the disc being attached to the shaft of the motor) has failed: the brake disc has broken. Is it possible to obtain a replacement disc, or perhaps the entire brake assembly, without having to replace the complete motor?
Thanks.

Mowerman
April 2010